He
also emphasized economical manufacturing techniques.M.^
. Since the storage battery required both powdered
nickel oxide and ore, Edison's men were able apply many
techniques used handling and processing crushed ore."
Most Edison's workers were expected able to
carry out both research and everyday engineering. designed a
rheostat for kinetophone road shows, and guide for lining up
the sprockets the machine with the aperture. Two promising combinations— one using
cadmium and another employing cobalt— were rejected because
these metals were too expensive use quantity. With
this experience behind them, his staff were able move the
battery rapidly from laboratory bench factory floor,
providing the speed and flexibility demanded the "old man. Kennedy, experimenter assigned the motion
picture product, covers work film splicing machine, film
cement, and methods sealing film cans. also inspected films. typical
report A. Kennedy's
experimental work for the same period included recording of
kinetophone subjects and changes lighting make the
figures stand out better movies. This
work drew his staff's experience battery manufacture and
ore milling.I-31
the experimenters also evaluated the cost and availability of
its raw materials.^ Edison
knew well that the commercial success his battery depended
on finding cheap and efficient electrochemical reaction. While the
chemical research progressed, Edison had his men design special
-purpose machines for each step battery production
